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Quattro DC Troubleshooting
Name Description
Possible Causes & Corrective Action
LS Overtemp
(fault)
One or more of the IGBT
modules on the line side
power bridge has exceeded
105
°C (221°F).
Overtemperature Problems
Manually verify 3-speed blower has correct
operation
Inspect and clean air intake filters
Verify ambient temperature is less than 45°C
Inspect IGBT modules for proper mounting
Verify drive is sized correctly
Possible defective temperature sensor
Excessive Current Draw
Decrease Accel / Decel rates
Mechanical brake not releasing properly
Excessive Field Weakening
Verify Weak Field Motor Parameters (A5)
LS Over Temp
(alarm)
One or more of the IGBT
modules on the line side
power bridge has exceeded
95
°C (203°F).
Overtemperature Problems
Manually verify 3-speed blower has correct
operation
Inspect and clean air intake filters
Verify ambient temperature is less than 45°C
LS Overvolt
The line side power converter
has detected an over-voltage
condition.
Low Input Voltage
Check INPUT L-L VOLTS (A5) and UV FAULT
LEVEL (A4)
Verify proper input voltage and increase, if
necessary, the input AC voltage within the
proper range
Check for missing input phase
Check power line disturbances due to starting
of other equipment
Line Converter Problem
Verify the line converter did not shutdown
while the motor controller was in process of
regeneration
Check Parameter Settings
Bad tuning of either the line side regulators
Contactor Problem
Verify motor contactor did not open while
motoring
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